package com.bro.person.plugin;

import java.util.List;
import org.mybatis.generator.api.CommentGenerator;
import org.mybatis.generator.api.IntrospectedTable;
import org.mybatis.generator.api.PluginAdapter;
import org.mybatis.generator.api.dom.java.Field;
import org.mybatis.generator.api.dom.java.JavaVisibility;
import org.mybatis.generator.api.dom.java.Method;
import org.mybatis.generator.api.dom.java.Parameter;
import org.mybatis.generator.api.dom.java.PrimitiveTypeWrapper;
import org.mybatis.generator.api.dom.java.TopLevelClass;
import org.mybatis.generator.api.dom.xml.Attribute;
import org.mybatis.generator.api.dom.xml.TextElement;
import org.mybatis.generator.api.dom.xml.XmlElement;

public class PaginationPlugin extends PluginAdapter {
    public PaginationPlugin() {
    }

    @Override
    public boolean modelExampleClassGenerated(TopLevelClass topLevelClass, IntrospectedTable introspectedTable) {
        this.addLimit(topLevelClass, introspectedTable, "limitOffset");
        this.addLimit(topLevelClass, introspectedTable, "limitRows");
        return super.modelExampleClassGenerated(topLevelClass, introspectedTable);
    }

    @Override
    public boolean sqlMapInsertElementGenerated(XmlElement element, IntrospectedTable introspectedTable) {
        this.buildKeyPropertyAttribute(element);
        return super.sqlMapInsertElementGenerated(element, introspectedTable);
    }

    @Override
    public boolean sqlMapInsertSelectiveElementGenerated(XmlElement element, IntrospectedTable introspectedTable) {
        this.buildKeyPropertyAttribute(element);
        return super.sqlMapInsertSelectiveElementGenerated(element, introspectedTable);
    }

    private void buildKeyPropertyAttribute(XmlElement element) {
        if (element != null) {
            element.addAttribute(new Attribute("useGeneratedKeys", "true"));
            element.addAttribute(new Attribute("keyProperty", "id"));
        }

    }

    @Override
    public boolean sqlMapSelectByExampleWithoutBLOBsElementGenerated(XmlElement element, IntrospectedTable introspectedTable) {
        XmlElement isNotNullElement = new XmlElement("if");
        isNotNullElement.addAttribute(new Attribute("test", "limitRows != null"));
        isNotNullElement.addElement(new TextElement("limit "));
        XmlElement rowsElement = new XmlElement("if");
        rowsElement.addAttribute(new Attribute("test", "limitOffset != null"));
        rowsElement.addElement(new TextElement("#{limitOffset}, "));
        isNotNullElement.addElement(rowsElement);
        isNotNullElement.addElement(new TextElement("#{limitRows}"));
        element.addElement(isNotNullElement);
        return super.sqlMapUpdateByExampleWithoutBLOBsElementGenerated(element, introspectedTable);
    }

    private void addLimit(TopLevelClass topLevelClass, IntrospectedTable introspectedTable, String name) {
        CommentGenerator commentGenerator = this.context.getCommentGenerator();
        Field field = new Field();
        field.setVisibility(JavaVisibility.PROTECTED);
        field.setType(PrimitiveTypeWrapper.getIntegerInstance());
        field.setName(name);
        commentGenerator.addFieldComment(field, introspectedTable);
        topLevelClass.addField(field);
        char c = name.charAt(0);
        String camel = Character.toUpperCase(c) + name.substring(1);
        Method method = new Method();
        method.setVisibility(JavaVisibility.PUBLIC);
        method.setName("set" + camel);
        method.addParameter(new Parameter(PrimitiveTypeWrapper.getIntegerInstance(), name));
        method.addBodyLine("this." + name + "=" + name + ";");
        commentGenerator.addGeneralMethodComment(method, introspectedTable);
        topLevelClass.addMethod(method);
        method = new Method();
        method.setVisibility(JavaVisibility.PUBLIC);
        method.setReturnType(PrimitiveTypeWrapper.getIntegerInstance());
        method.setName("get" + camel);
        method.addBodyLine("return " + name + ";");
        commentGenerator.addGeneralMethodComment(method, introspectedTable);
        topLevelClass.addMethod(method);
    }

    public boolean validate(List<String> warnings) {
        return true;
    }
}
